Hi, Ron.
I'm glad that was helpful.
Since you already have Bose L1 gear (which model do you have?) - let me get into some detail about that for you.
The 4-channel mixer is called the T1 (unless you've got the newer stereo version, the T4S). I've been running my guitars (electric and acoustic) through Bose L1 gear since 2003. Until this summer, I ran my Kemper Profiler (Toaster with Remote) through the Bose T1 plus L1 Model II. It always sounded great. Since I sing too, I ran everything; guitars and vocals through the L1 set it up behind me (yay, no monitors). If you'd consider doing that - I can tell you, you get a great FRFR (Full Range, Flat Response) experience. But you won't get the amp-in-the-room vibe you'll get with the PE-60.
When I started doing the outdoor lockdown gigs, I had to go super-portable. I got the Stage and took my Bose T1 and L1 Compact. I've since replaced the L1 Compact with the L1 Pro 8 (the smallest of the new models - 35 pounds). For regular gigs, I'm replacing my L1 Model II with the L1 Pro 32. I'm anxiously awaiting the UPS guy - any day now.
I'm ecstatically happy with the sound of the Kemper Profilers (either one) through the Bose gear.
Amp-in-the-Room?
Last year, I set up a couple of EV M-12G cabinets with EVM 12L Series II drivers and a stereo power amp. I was curious about the whole amp-in-the-room sound that I had not heard in 17 years. This is a lot of fun, and it sounds great.
Having said all that, I'd never drag all that stuff to a gig (85 pounds). Aside from the stereo aspect, this is similar to what you'd experience with the PE 60. Considering the Tech 21 PE60 weighs 43 pounds, I know I'd leave that behind and carry the L1 instead.
When you get your Kemper (whichever one), run the Main Outputs through your Bose gear. Definitely do that before spending money to add the Kone to the PE 60.
Cheers!
ST